Question

The mean of 20 numbers is 40.if 10 is added to every no.

Answer 1

The mean of the numbers will become 50.

For the first set of numbers (The mean of 20 being 40) the sum of those 20 numbers would be 800.

If you added 10 to each number, the sum would become 800 + (20)(10) = 1000

Then we can divide the sum by 20 to get the mean, which would be 50